1. cap FPS at lower fps (I can still get this bug at 60 fps, but it's easier to reproduce at lower fps like 10)
2. holy Y to enter editor
3. release the key too early
4. the icon is stuck on the screen

For the texture alpha 0.08:
I had a similar issue with a texture I was using before.
I saw a weird shadow where there was no alpha in the source png file. Ended up discovering the import settings.
I couldn't find it on the wiki, so maybe a texture importing guide or some introduction on the settings would be good for wokrbench,
because I was confused (or if such wiki exists, perhaps adding more tags or descriptions so it shows up on searches bettter)